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Posted to common-issues@hadoop.apache.org by "Aaron T. Myers (JIRA)" <ji...@apache.org> on 2012/09/29 03:01:07 UTC
[jira] [Updated] (HADOOP-8866) SampleQuantiles#query is O(N^2)
instead of O(N)
[ https://issues.apache.org/jira/browse/HADOOP-8866?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Aaron T. Myers updated HADOOP-8866:
-----------------------------------
Resolution: Fixed
Fix Version/s: 2.0.3-alpha
Hadoop Flags: Reviewed
Status: Resolved (was: Patch Available)
I've just committed this to trunk and branch-2. Thanks a lot for the contribution, Andrew.
> SampleQuantiles#query is O(N^2) instead of O(N)
> -----------------------------------------------
>
> Key: HADOOP-8866
> URL: https://issues.apache.org/jira/browse/HADOOP-8866
> Project: Hadoop Common
> Issue Type: Improvement
> Affects Versions: 2.0.2-alpha
> Reporter: Andrew Wang
> Assignee: Andrew Wang
> Priority: Minor
> Fix For: 2.0.3-alpha
>
> Attachments: hdfs-3976-1.patch
>
>
> SampleQuantiles#query() does O(N) calls LinkedList#get() in a loop, rather than using an iterator. This makes query O(N^2), rather than O(N).
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